Arduino ESP32 Parsing RSA public key in PEM format from string

parse_rsa_pub_key_pem_str.cpp

#include "mbedtls/pk.h"
#include "mbedtls/error.h"

mbedtls_pk_context pk;

const char* esp_pub_key_pem_test = "-----BEGIN PUBLIC KEY-----\n\
MIGfMA0GCSqGSIb3DQEBAQUAA4GNADCBiQKBgQDXn7jOg8QBSKJNmN4FqWtXa/+9\n\
BbOpHdtN7k9ij95xQmLPV/DptPPKgM6mhK4k7va3ftD+Gv7LcmPELCPMqIvq2aLf\n\
tgAb80HyHorfk6zQfNcyyJ0fblpyVschCMtO3qD4wahLlUcECf7uyVRFBHPxVrwi\n\
UmK6TCiIjnSF2QahywIDAQAB\n\
-----END PUBLIC KEY-----";

void setup() {
  mbedtls_pk_init(&pk);
  
  size_t key_len = strlen(esp_pub_key_pem_test) + 1;

  int res = mbedtls_pk_parse_public_key(&pk, (const uint8_t*)esp_pub_key_pem_test, key_len);
  if (res != 0) {
    char buff[512];
    mbedtls_strerror(res, buff, sizeof(buff));
    printf("Parse key error: %s\n", buff);
    return;
  }

  printf("Parse key ok\n");
}

void loop() {
  delay(10);
}